|
好记心不如烂笔头,为了方便以后快速查阅代码,提高开发效率,在这里特将LTDC驱动的初始化代码贴上来。本代码是基于ST官方STM32F429 Discovery Demo板的,学习LTDC驱动时参考了Demo板的官方例程,但是总觉得官方例程写得有点繁琐,不简洁明了,于是在此基础上重新整理代码得到如下初始化模板。
关于Discovery Demo板的原理图及例程,可以到这里去下载:http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/PF259090
关于本工程源码,请直接点击下载:
LTDC_Test.zip
(429 KB, 下载次数: 408)
说明:本测试例程只使用了Layer1,显示缓冲区为FrameBuffer,颜色格式为RGB565,初始时缓冲区为0,所以显示Layer1时是全黑色,如果不使能Layer1只显示background,则屏幕显示为红色。
LCD初始化函数:- void LCD_Init(void)
- {
- LTDC_InitTypeDef LTDC_InitStruct;
-
- /* Configure the LCD Control pins ------------------------------------------*/
- LCD_CtrlLinesConfig();
-
- /* Configure the LCD_SPI interface -----------------------------------------*/
- LCD_SPI_Config();
-
- /* Power on the LCD --------------------------------------------------------*/
- LCD_PowerOn();
-
- /* Enable the LTDC Clock */
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_LTDC, ENABLE);
-
- /* Configure the LCD Control pins */
- LCD_GPIO_Config();
-
- /* Enable Pixel Clock ------------------------------------------------------*/
-
- /* Configure PLLSAI prescalers for LCD */
- /* PLLSAI_VCO Input = HSE_VALUE/PLL_M = 1 Mhz */
- /* PLLSAI_VCO Output = PLLSAI_VCO Input * PLLSAI_N = 192 Mhz */
- /* PLLLCDCLK = PLLSAI_VCO Output/PLLSAI_R = 192/3 = 64 Mhz */
- /* LTDC clock frequency = PLLLCDCLK / RCC_PLLSAIDivR = 64/8 = 8 Mhz */
- RCC_PLLSAIConfig(192, 7, 3);
- RCC_LTDCCLKDivConfig(RCC_PLLSAIDivR_Div8);
-
- /* Enable PLLSAI Clock */
- RCC_PLLSAICmd(ENABLE);
- /* Wait for PLLSAI activation */
- while(RCC_GetFlagStatus(RCC_FLAG_PLLSAIRDY) == RESET)
- {
- }
-
- /* LTDC Initialization -----------------------------------------------------*/
-
- /* Initialize the horizontal synchronization polarity as active low*/
- LTDC_InitStruct.LTDC_HSPolarity = LTDC_HSPolarity_AL;
- /* Initialize the vertical synchronization polarity as active low */
- LTDC_InitStruct.LTDC_VSPolarity = LTDC_VSPolarity_AL;
- /* Initialize the data enable polarity as active low */
- LTDC_InitStruct.LTDC_DEPolarity = LTDC_DEPolarity_AL;
- /* Initialize the pixel clock polarity as input pixel clock */
- LTDC_InitStruct.LTDC_PCPolarity = LTDC_PCPolarity_IPC;
-
- /* Timing configuration */
- /* Configure horizontal synchronization width */
- //LTDC_InitStruct.LTDC_HorizontalSync = 9;
- LTDC_InitStruct.LTDC_HorizontalSync = 9;
- /* Configure vertical synchronization height */
- LTDC_InitStruct.LTDC_VerticalSync = 1;
- /* Configure accumulated horizontal back porch */
- LTDC_InitStruct.LTDC_AccumulatedHBP = 29;
- /* Configure accumulated vertical back porch */
- LTDC_InitStruct.LTDC_AccumulatedVBP = 3;
- /* Configure accumulated active width */
- LTDC_InitStruct.LTDC_AccumulatedActiveW = 269;
- /* Configure accumulated active height */
- LTDC_InitStruct.LTDC_AccumulatedActiveH = 323;
- /* Configure total width */
- LTDC_InitStruct.LTDC_TotalWidth = 279;
- /* Configure total height */
- LTDC_InitStruct.LTDC_TotalHeigh = 327;
-
- /* Configure R,G,B component values for LCD background color */
- LTDC_InitStruct.LTDC_BackgroundRedValue = 0xff;
- LTDC_InitStruct.LTDC_BackgroundGreenValue = 0;
- LTDC_InitStruct.LTDC_BackgroundBlueValue = 0;
-
- LTDC_Init(<DC_InitStruct);
- }
复制代码 LCD串行控制信号线配置:- void LCD_CtrlLinesConfig(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- /* Enable GPIOs clock*/
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD, ENABLE);
- /* Configure NCS in Output Push-Pull mode */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
-
- /* Configure WRX in Output Push-Pull mode */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
- GPIO_Init(GPIOD, &GPIO_InitStructure);
- /* Set chip select pin high */
- GPIO_SetBits(GPIOC, GPIO_Pin_2);
- }
复制代码- void LCD_SPI_Config(void)
- {
- SPI_InitTypeDef SPI_InitStructure;
- GPIO_InitTypeDef GPIO_InitStructure;
- /* Enable LCD_SPI_SCK_GPIO_CLK, LCD_SPI_MISO_GPIO_CLK and LCD_SPI_MOSI_GPIO_CLK clock */
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);
- /* Enable LCD_SPI and SYSCFG clock */
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI5, ENABLE);
-
- /* Configure LCD_SPI SCK pin */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
- GPIO_Init(GPIOF, &GPIO_InitStructure);
- /* Configure LCD_SPI MISO pin */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
- GPIO_Init(GPIOF, &GPIO_InitStructure);
- /* Configure LCD_SPI MOSI pin */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
- GPIO_Init(GPIOF, &GPIO_InitStructure);
- /* Connect SPI SCK */
- GPIO_PinAFConfig(GPIOF, GPIO_PinSource7, GPIO_AF_SPI5);
- /* Connect SPI MISO */
- GPIO_PinAFConfig(GPIOF, GPIO_PinSource8, GPIO_AF_SPI5);
- /* Connect SPI MOSI */
- GPIO_PinAFConfig(GPIOF, GPIO_PinSource9, GPIO_AF_SPI5);
-
- SPI_I2S_DeInit(SPI5);
- /* SPI configuration -------------------------------------------------------*/
- SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
- SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
- SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
- SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
- SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
- SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
- /* SPI baudrate is set to 5.6 MHz (PCLK2/SPI_BaudRatePrescaler = 90/16 = 5.625 MHz)
- to verify these constraints:
- - ILI9341 LCD SPI interface max baudrate is 10MHz for write and 6.66MHz for read
- - l3gd20 SPI interface max baudrate is 10MHz for write/read
- - PCLK2 frequency is set to 90 MHz
- */
- SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
- SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
- SPI_InitStructure.SPI_CRCPolynomial = 7;
- SPI_Init(SPI5, &SPI_InitStructure);
- /* Enable L3GD20_SPI */
- SPI_Cmd(SPI5, ENABLE);
- }
复制代码 LCD同步信号及数据信号GPIO配置:- void LCD_GPIO_Config(void)
- {
- GPIO_InitTypeDef GPIO_InitStruct;
-
- /* Enable GPIOI, GPIOJ, GPIOG, GPIOF, GPIOH AHB Clocks */
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | \
- RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD | \
- RCC_AHB1Periph_GPIOF | RCC_AHB1Periph_GPIOG, ENABLE);
-
- /* GPIOs Configuration */
- /*
- +------------------------+-----------------------+----------------------------+
- + LCD pins assignment +
- +------------------------+-----------------------+----------------------------+
- | LCD_TFT R2 <-> PC.12 | LCD_TFT G2 <-> PA.06 | LCD_TFT B2 <-> PD.06 |
- | LCD_TFT R3 <-> PB.00 | LCD_TFT G3 <-> PG.10 | LCD_TFT B3 <-> PG.11 |
- | LCD_TFT R4 <-> PA.11 | LCD_TFT G4 <-> PB.10 | LCD_TFT B4 <-> PG.12 |
- | LCD_TFT R5 <-> PA.12 | LCD_TFT G5 <-> PB.11 | LCD_TFT B5 <-> PA.03 |
- | LCD_TFT R6 <-> PB.01 | LCD_TFT G6 <-> PC.07 | LCD_TFT B6 <-> PB.08 |
- | LCD_TFT R7 <-> PG.06 | LCD_TFT G7 <-> PD.03 | LCD_TFT B7 <-> PB.09 |
- -------------------------------------------------------------------------------
- | LCD_TFT HSYNC <-> PC.06 | LCDTFT VSYNC <-> PA.04 |
- | LCD_TFT CLK <-> PG.07 | LCD_TFT DE <-> PF.10 |
- -----------------------------------------------------
-
- */
-
- /* GPIOA configuration */
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource4, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource12, GPIO_AF_LTDC);
-
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_6 | \
- GPIO_Pin_11 | GPIO_Pin_12;
- GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
- GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
- GPIO_Init(GPIOA, &GPIO_InitStruct);
-
- /* GPIOB configuration */
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_LTDC);
-
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_8 | \
- GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
- GPIO_Init(GPIOB, &GPIO_InitStruct);
-
- /* GPIOC configuration */
- GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_LTDC);
-
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;// | GPIO_Pin_10;
- GPIO_Init(GPIOC, &GPIO_InitStruct);
-
- /* GPIOD configuration */
- GPIO_PinAFConfig(GPIOD, GPIO_PinSource3, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOD, GPIO_PinSource6, GPIO_AF_LTDC);
-
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_6;
- GPIO_Init(GPIOD, &GPIO_InitStruct);
-
- /* GPIOF configuration */
- GPIO_PinAFConfig(GPIOF, GPIO_PinSource10, GPIO_AF_LTDC);
-
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10;
- GPIO_Init(GPIOF, &GPIO_InitStruct);
-
- /* GPIOG configuration */
- GPIO_PinAFConfig(GPIOG, GPIO_PinSource6, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOG, GPIO_PinSource7, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOG, GPIO_PinSource10, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOG, GPIO_PinSource11, GPIO_AF_LTDC);
- GPIO_PinAFConfig(GPIOG, GPIO_PinSource12, GPIO_AF_LTDC);
-
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_10 | \
- GPIO_Pin_11 | GPIO_Pin_12;
- GPIO_Init(GPIOG, &GPIO_InitStruct);
- }
复制代码 LCD上电初始化序列,请对照LCD datasheet要求进行配置,此处省略部分内容:- /**
- * @brief Configure the LCD controller (Power On sequence as described in ILI9341 Datasheet)
- * @param None
- * @retval None
- */
- void LCD_PowerOn(void)
- {
- LCD_WriteCommand(0xCA);
- LCD_WriteData(0xC3);
- LCD_WriteData(0x08);
- LCD_WriteData(0x50);
- LCD_WriteCommand(LCD_POWERB);
- LCD_WriteData(0x00);
- LCD_WriteData(0xC1);
- LCD_WriteData(0x30);
- LCD_WriteCommand(LCD_POWER_SEQ);
- LCD_WriteData(0x64);
- LCD_WriteData(0x03);
- LCD_WriteData(0x12);
- LCD_WriteData(0x81);
-
- ...
- LCD_WriteCommand(LCD_SLEEP_OUT);
- delay(200);
- LCD_WriteCommand(LCD_DISPLAY_ON);
- /* GRAM start writing */
- LCD_WriteCommand(LCD_GRAM);
- }
复制代码 Layer初始化:- void LCD_Layer1Init(void)
- {
- LTDC_Layer_InitTypeDef LTDC_Layer_InitStruct;
- /* Windowing configuration */
- /* In this case all the active display area is used to display a picture then:
- Horizontal start = horizontal synchronization + Horizontal back porch = 30
- Horizontal stop = Horizontal start + window width -1 = 30 + 240 -1
- Vertical start = vertical synchronization + vertical back porch = 4
- Vertical stop = Vertical start + window height -1 = 4 + 160 -1 */
- LTDC_Layer_InitStruct.LTDC_HorizontalStart = 30;
- LTDC_Layer_InitStruct.LTDC_HorizontalStop = (240 + 30 - 1);
- LTDC_Layer_InitStruct.LTDC_VerticalStart = 4;
- LTDC_Layer_InitStruct.LTDC_VerticalStop = 320 + 4 -1;
-
- /* Pixel Format configuration*/
- LTDC_Layer_InitStruct.LTDC_PixelFormat = LTDC_Pixelformat_RGB565;
-
- /* Alpha constant (255 totally opaque) */
- LTDC_Layer_InitStruct.LTDC_ConstantAlpha = 255;
-
- /* Configure blending factors */
- LTDC_Layer_InitStruct.LTDC_BlendingFactor_1 = LTDC_BlendingFactor1_PAxCA;
- LTDC_Layer_InitStruct.LTDC_BlendingFactor_2 = LTDC_BlendingFactor2_PAxCA;
-
- /* Default Color configuration (configure A,R,G,B component values) */
- LTDC_Layer_InitStruct.LTDC_DefaultColorBlue = 0;
- LTDC_Layer_InitStruct.LTDC_DefaultColorGreen = 0;
- LTDC_Layer_InitStruct.LTDC_DefaultColorRed = 0;
- LTDC_Layer_InitStruct.LTDC_DefaultColorAlpha = 0;
-
- /* Input Address configuration */
- LTDC_Layer_InitStruct.LTDC_CFBStartAdress = (u32)FrameBuffer;
-
- /* the length of one line of pixels in bytes + 3 then :
- Line Lenth = Active high width x number of bytes per pixel + 3
- Active high width = 240
- number of bytes per pixel = 2 (pixel_format : RGB565)
- */
- LTDC_Layer_InitStruct.LTDC_CFBLineLength = ((240 * 2) + 3);
-
- /* the pitch is the increment from the start of one line of pixels to the
- start of the next line in bytes, then :
- Pitch = Active high width x number of bytes per pixel
- */
- LTDC_Layer_InitStruct.LTDC_CFBPitch = (240 * 2);
-
- /* configure the number of lines */
- LTDC_Layer_InitStruct.LTDC_CFBLineNumber = 320;
-
- LTDC_LayerInit(LTDC_Layer1, <DC_Layer_InitStruct);
- LTDC_LayerCmd(LTDC_Layer1, ENABLE);
- LTDC_ReloadConfig(ENABLE);
- }
复制代码 主程序:- int main(void)
- {
- LCD_Init();
- LCD_Layer1Init();
- LTDC_Cmd(ENABLE);
- while(1);
- }
复制代码
本贴来自于本人博客:http://blog.csdn.net/hexiaolong2009/article/details/43986205 |
|